Solving Diophantine Equations Using CRT

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SUMMARY

The discussion focuses on solving a system of Diophantine equations using the Chinese Remainder Theorem (CRT). The equations presented are 24x + 11y ≡ 4 (mod 35) and 5x + 7y ≡ -13 (mod 35). The user successfully reduces these equations modulo 5 and 7, finding solutions (2,1) and (3,4) respectively. Applying CRT, the final solutions are determined as x ≡ 17 (mod 35) and y ≡ 11 (mod 35).

PREREQUISITES
  • Understanding of Diophantine equations
  • Familiarity with modular arithmetic
  • Knowledge of the Chinese Remainder Theorem (CRT)
  • Basic algebraic manipulation skills
NEXT STEPS
  • Study the application of the Chinese Remainder Theorem in different contexts
  • Learn about modular arithmetic properties and their implications
  • Explore advanced techniques for solving Diophantine equations
  • Investigate software tools for symbolic computation, such as SageMath or Mathematica
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Mathematicians, computer scientists, and students interested in number theory and algebraic problem-solving will benefit from this discussion.

ascheras
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ok, so I've never done a problem like this one before:

find all solutions:

24x + 11y == 4 (mod 35)
5x + 7y == -13 (mod 35).

This reduces to:
24x + 11y == 4 (mod 5)
5x + 7y == -13 (mod 5).

and
24x + 11y == 4 (mod 7)
5x + 7y == -13 (mod 7).

Solving the two, i get (2,1) and (3,4) respectively.
Do I now apply the CRT to get all the solutions?
 
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I'm not quite sure about it, but I think that you should now solve these systems

x == 2 (mod5)
x == 3 (mod7)

which gives x == 17 (mod35)

and

y == 1 (mod5)
y == 4 (mod7)

which gives y == 11 (mod35)
 
Yes, from the above, using CRT gives you :

[tex]x \equiv 17~(mod~35)~~y \equiv 11~(mod~35)[/tex]
 

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